Ultra Packets for portable restrooms and holding tanks from CPACEX are formulated with a high level of fragrance and dye. They offer continuous odor control and fragrance for up to seven days in extreme temperatures and conditions. This is important at special events where overuse situations may occur. Additional effervescence assures that the packets dissolve quickly and disperse evenly throughout the holding tank. They are available in four different strengths to fit specific applications and climates. They are biodegradable and contain nonstaining, rich blue dye. 800-974-7383; www.cpacex.com.